Vintage baby two piece purple and white dress

Two piece vintage baby dress. First piece is a lovely purple dress with ruffles and lace. Second piece slips over and has cap sleeves with even more ruffles, lace and a pretty little ribbon. Both pieces are marked 6-9 month and are in immaculate condition. I noticed one place where the lace seems to have yellowed slightly with age and have shown it in a photo. It just looks like a shadow and it barely noticeable. I haven't tried washing it.